Skiving machine



March 25, 1941. F. L. BRANDT 2,235,916

SKIVING MACHINE Filed Jan. 12, 1940 WM; W4.

Patented Mar. 25, 1941 UNITED STATES PATENT OFFICE SKIVIN G MACHINE Application January 12, 1940, Serial No. 313,597

12 Claims.

This invention relates to skiving machines and is herein illustrated as embodied in a machine particularly adapted for use in repairing shoes, for example, to reduce the thickness of the side and front edges of a tap sole or to bevel its rear edge, or to perform both operations.

In the repairing of shoes it is customary, when the forepart of the sole is to be replaced by a tap sole which is stitched or nailed in place, to remove the forepart of the worn sole of the shoe by severing the sole on a bevel at a locality to the rear of the ball line and removing said forepart, after which the forepart is replaced by a tap sole, the rear end of which is skived on a bevel complementary, or substantially so, to the bevel on the forward end of that part of the sole which was not removed. If the shoe to be repaired is a womans shoe having a sole which is attached by cement, the forepart is usually not removed in the manner indicated above. Instead,

, the thickness of the whole forepart of the sole is greatly reduced by a buffing or scouring operation, and the edge is further reduced on a bevel, after which there is cemented to the forepart of the shoe 2. tap sole, the thickness of the edge of which has been skived to fit the beveled edge of the old sole. The machine of the present invention is capable of performing the above-mentioned and other skiving operations. To this end, there is provided in accordance with one feature of the invention a machine having a fixed knife, a work-support, an edge-guide, means for feeding the work over the work-support to the knife, and means for mounting the work-support and the edge-guide for angular adjustment to vary the width of the scarf. With such a construction, the inclination of the scarf may readily be changed.

According to another feature of the invention, the work-support and edge-guide are not only adjustable angularly to vary the inclination of the scarf, but are also adjustable bodily toward and from the knife to vary the thickness of the edge of the scarf. In the illustrated machine, the work-support and the edge-guide are rigid with each other, and are supported at the upper end of a plate, the lower end of which is curved.

cluding certain details of construction and combinations of parts, will be described as embodied in an illustrated machine and pointed outin the appended claims.

Referring now to the accompanying drawing, *5

Fig. 1 is an elevation of a machine in which the present invention is embodied;

Fig, 2 is an end elevation of a portion of the machine showing more particularly the workengaging parts;

Fig. 3 is a detail in section showing the bore and the intersecting slot, which aid in holding the knife in place; and

Fig. 4 is a detail, principally in section, showing how the knife is held.

Mounted for swinging movement on the frame '5 of the machine about a pivot 8 is an overhanging arm 9 urged downwardly at all times by two tension springs, one of which is shown at H, as far as a stop face I3 on the frame will permit. Rotatable in the arm 9 is a shaft l5, to one end of which is fastened by a set screw I? the hub of a crank arm I9, which is provided with a handle 2|. Near its outer end the shaft carries a feed roll 23. Rotatably mounted on the end of the shaft l5 beyond the feed roll is the hub of a hololdown 25, said hub being held in place by an enlarged end of the shaft I5. A pin 24, driven into the shaft and projecting, into a groove in the feed roll which extends lengthwise of the roll and 30 shaft, causes rotation of the roll with the shaft and permits the shaft to be drawn through the roll. The holddown carries a presser roll 21 and has an upwardly extending tall 25 provided with a finger piece 28, said tail being engaged by a spring-pressed plunger 29 mounted in a socket in a lug formed on the arm 9, the plunger acting continually to urge the presser roll 2'! to swing down as far as a stop will permit. This stop is a shoulder 30 on the outer edge of a curved portion of the arm .9 which overhangs the feed ro11 The purpose of the roll 21 is to hold flat upon the work support a considerable portion of the work at a locality adjacent to that engaged by the knife.

A work support 3| having a substantially flat work-engaging face has rigid with it an edge guide 33 projecting from its upper face and a plate 35 projecting down from its underside. The plate has a curved lower edge, the center of curvature of which lies in the line of intersection a: of the work-engaging faces of the work-support and the edge-guide, the plate being received in a slot in a member 31 the bottom of which has the same curvature as the lower edge of the plate. In the two walls of the slotted member 31 are two series of alined holes numbered, respectively, from 0 to 6, and in the plate 35 is a single series of holes, a locking pin 39 being provided for holding the plate in adjusted angular position. The row of holes in the plate and the rows of alined holes in the walls of the slotted member are so located that when any one hole in the plate registers with two alined holes in the walls of the member 31, no other hole in the plate registers with any other hole in the walls of said member. When the pin 39 is in the hole marked 0, the work-support is parallel to the edge of the knife, the holes numbered I to 6 corresponding, respectively, to inclinations of from 1 to 6. When the operator wishes to produce a scarf having no inclination, or an inclination of any desired degree from 1 to 6, he merely puts the pin in the proper numbered hole in the slotted member and tilts the plate 35 until the pin can be pushed in. It will necessarily enter the proper one of the holes in the plate 35. The inclinations from 1 to 6 are principally useful in reducing the side and front edges of a tap sole. The 0 inclination is for use in evening straps and similar articles. When it is desired to skive the rear edge of a tap sole, the pin 39 is removed, and the worksupport swings down about the axis X until its underside rests upon the slotted member 31, its inclination then being in the neighborhood of from 12 to 15.

The slotted member 31 has a stem I31 rectangular in cross section, which is vertically slidable in a vertical guideway formed in a projection I01 of the frame of the machine and closed on its open side by a plate, not shown, which is fastened to the projection by screws 4|. In a wall of the guideway is a series of holes numbered from 5 to 6, which respresent thicknesses in irons of the edge of the scarf, and in the stem is another series of holes, a pin 43 being provided for holding the stem I31 in adjusted position. These two series or rows of holes are arranged, like the rows or series of holes which have been described above, in such manner that when a hole in the projection I01 registers with a hole in the stem II! no other holes are in register. A pin H8 driven into the upper part of the slotted member 31, by contacting with the frame, prevents accidental contact of the work-support with the knife.

The work I00, such as a sole, with its edge in contact with the edge-guide 33 is fed over the work-support 3| to a fixed knife 45. In order to hold the knife firmly in place, as well as to permit its ready removal and its replacement to a position in which the cutting edge always occupies the same position, the following construction is provided. Referring now to Figs. 3 and 4, there is in the frame of the machine a horizontal slot 41 to receive one portion of the knife, said slot intersecting transversely a bore 49 adapted to receive a locking bolt 5| having in it a longitudinal slot 53 in which a portion of the knife is slidable. The slot 41 in the frame and the slot 53 in the bolt register crosswise of the slot 53 and have the same height which is just sufiicient to permit the knife to slide in them. The knife is held firmly in place by a nut 54 which is threaded on one end of the bolt, engages the back of the knife and forces the bevel of the knife against a stop. As herein shown, the stop is provided by making the inner end of the slot 41 in the frame of the machine of reduced height so as to form a step or shoulder 55 at the bottom of the slot, said shoulder being adapted to engage the bevel of the knife. When it is desired to remove the knife, for example to grind it, the nut 54 is unscrewed from the bolt 5|, and the knife is removed and ground. To replace the knife it is slid into the'registering slots 53 and 4'! in the bolt and in the frame, after which the nut 54 is screwed again on the pin 5| to force the bevel of the knife against the stop 55. The cutting edge of the knife thus always occupies the same position, irrespective of how much the knife has been shortened by grinding.

In the operation of the machine, the worksupport and edge-guide are adjusted vertically and angularly and locked in the desired position by means of the pins 43 and 39. The leadin end of the work is placed upon the work-support beneath the presser roll 21 with the edge of the work against the edge-guide, after which the operator rotates the crank with one hand, while with the other he guides the work, a guard Bl, herein shown as a projection from the holddown, serving to protect the operators fingers from injury. Ordinarily it will not be necessary to raise the presser roll 2? in order to get the work beneath it, but if the work is unusually thick the finger piece 28 may be pushed to raise the roll.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

l. A skiving machine having in combination a knife, a stationary work-support, a feed roll for advancing the work over the work-support to the knife, and means for mounting the work-support for angular adjustment about an axis which extends in the direction of feed movement of the work to vary the inclination of the scarf.

2. A skiving machine having in combination a knife, a stationary work-support, a feed roll for advancing the work over the work-support to the knife, and means for mounting the worksupport for angular adjustment about an axis which extends in the direction of feed movement of the work to vary the inclination of the scarf and for adjustment toward and from the knife to vary the thickness of the edge of the scarf.

3. A skiving machine having in combination a fixed knife, a work-support, an edge-guide extending at an angle to the work-engaging face of the Work-support, a feed roll for advancing the work over the work-support to the knife, and means for mounting the work-support and the edge-guide for angular adjustment to vary the inclination of the scarf.

4. A skiving machine having in combination a fixed knife, a work-support, an edge-guide extending at an angle to the work-engaging face of the work-support, a feed roll for advancing the work over the work-support to the knife, and means for mounting the work-support and the edge-guide for angular adjustment about an axis which coincides substantially with the intersection of the work-engaging faces of the worksupport and the edge-guide.

5. A skiving machine having in combination a knife, a work-support, an edge-guide, a plate by which the work-support and the edge-guide are carried, said plate having a lower edge the center of curvature of which lies substantially in the line of intersection of the work-engaging faces of the work-support and the edge-guide, and a member on which said plate is angularly adjustable to vary the inclination of the scarf.

6. A skiving machine having in combination a knife, a work-support, an edgeguide, a plate by which the work-support and the edge-guide are carried, said plate having a lower edge the center of curvature of which lies substantially in the line of intersection of the work-engaging faces of the work-support and the edge-guide, a member on which said plate is angularly adjustable to vary the inclination of the scarf, and means for mounting said member for adjustment toward and from the knife and roll to vary the thickness of the edge of the scarf.

7. A skiving machine having in combination a knife, a work-support, an edge-guide, a plate by which the work-support and edge-guide are carried, said plate having a lower edge the center of curvature of which lies substantially in the line of intersection of the work-engaging faces of the work-support and the edge-guide, a member having a portion curved to correspond to the curvature of the lower edge of the plate for receiving upon it said lower edge, and means for holding the plate in adjusted angular position on the member.

8. A skiving machine having in combination a knife, a work-support, an edge-guide, a plate by which the work-support and edge-guide are carried, said plate having a. lower edge the center of curvature of which lies substantially in the line of intersection of the work-engaging faces of the work-support and the edge-guide, a memher having a portion curved to correspond to the curvature of the lower edge of the plate for receiving upon it said lower edge, and means for holding the plate in adjusted angular position on the member, said means comprising a row of holes in the plate, a row of holes in said member and a locking pin, the holes in the rows being so located that when any one hole in the plate registers with a. hole in the member no other hole in the plate registers with any other hole in the member.

9. A skiving machine having in combination a fixed knife, a work-support, an edge-guide, a member in which the work-support and the edgeguide are mounted for angular adjustment to vary the inclination of the scarf, a guideway in which the stem of the member is slidably received, and means for holding the stem in adjusted position in the socket, said means comprising a row of holes in the stem and a row of holes in a wall of the guideway, and a locking pin, the construction being such that when the locking pin is in two registering holes, one in the stem and the other in the socket, none of the other holes: are in register.

10. A skiving machine having in combination a fixed knife, means for advancing the work to the knife, and means for removably fastening the knife in place, said means comprising a bore in the frame, a knife-receiving slot intersecting the bore, a bolt in the bore, said bolt having a knifereceiving slot in register with the slot in the frame, a nut threaded on the bolt and adapted to engage the back of the knife and slide the knife along in the slots, and means for arresting the sliding movement of the knife.

11. A skiving machine having in combination a fixed knife having a bevel along its edge, means for advancing the work to the knife, and means for removably fastening the knife to the frame, said means comprising a bore in the frame, a knife-receiving slot intersecting the bore, a bolt in the bore said bolt having a knife-receiving slot in register with the slot in the frame, a nut threaded on the bolt and contacting with the back of the knife, and a stop for engaging the bevel of the knife.

12. A skiving machine having in combination a knife, a work-support angularly adjustable to vary the inclination of the scarf, an overhanging arm mounted for pivotal movement, a rotary shaft mounted in said arm, a feed roll mounted near the outer end of said shaft, a holddown mounted outside the feed roll for angular movement about the shaft, and yielding means carried by the arm for urging the holddown to swing in a direction to cause it to press the work against the work-support.

FRANCIS L. BRANDT. 

